Source View: pre_update_site_option_{$option}

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
1209       *
1210       * The dynamic portion of the hook name, `$option`, refers to the option name.
1211       *
1212       * @since 2.9.0 As 'pre_update_site_option_' . $key
1213       * @since 3.0.0
1214       *
1215       * @param mixed $value     New value of site option.
1216       * @param mixed $old_value Old value of site option.
1217       */
1218      $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value );
1219
1220      if ( $value === $old_value )
1221           return false;
1222
1223      if ( false === $old_value )
1224           return add_site_option( $option, $value );
1225
1226      $notoptions_key = "{$wpdb->siteid}:notoptions";
1227      $notoptions = wp_cache_get( $notoptions_key, 'site-options' );